Friction and metal plug for rubber heels, &amp;c.



s. J. HARRIS. FRICTION AND METAL PLUG FQB. RUBBER HEELS, 6w. APPLICATION FILED 00'!- 8, 1914.

1,129,672. Patented Feb. 23, 1915.

FRICTYON "AND METAL PLUG FOB? RUBBERHEELS,

Specifieation'nf Letters Patent. P t t d p 235E155 Application filed October 8,-1914. Serial uas'esjzz'z.

T auto/ 10m it may (on-corn Be itknownthat I, SAMUEL J. HARRIS, acitizen of the United States, resident of Stoughton, in the county of' Norfol'l't' and ;::State-of ="i\ ass'ach'use tts, have made-a certain" new" and useful Invention in Fri'etion and Metal .1 Plugs for Rubber"Heels,-" &e.; and I declare the followingto be aful'l, clear, and exact=-description of the same, such as will :enable: others skilled in" the art to which it appertainsto make and use the invention, reference-beinghad to the accompanyingdrawings,- and toletters or figuresofre-ferencemarked thereon; which form-a part'of this"- specification Figure l is abottom planwiew'of'a rubber heelhaving my invention applied thereto-(- FigJ-J2 is a top plan view-of :thewv'ear 'lift of the heel having the invention applied thereto; Fig. 3 is-a' section on 'the line-'3-f-3, Fig.-

1. Fig. 4 is a detail bottom plan viewof themetal frame plate" and 'posts, \vith' a canvas plug in engagementwith= one of the posts.

' Fig: 5 isa detail side viewofth'e' same. Fig.

.ZG-isa detail bottom-plan "iew of'a modification-of the metal frame plater The invention-has relation'-*to means for reducing: wear upon" and preventing slip page; of rubber: heels and other treadi'sur faces, having; for its object 'theprovision-"of a friction and" metal plug "therefor, and it consists in the novel construction' 'and"coup bination's of'devices, as hereinafter setforth;

Inthe 'aecomp'a' nyingrd aw-ingsfillustra t ing: the invention as app'li'ed to a; rubberheel the numeral 2 indicates the topor 'we'a'r'lift' of -the heel, which in use formsthe-liottom of'the heel, and 3 the'lift neXt-toit, other lifts being sometimes employed; according -torequirement, these lifts forming-"-when' compressed together and finished, as hereinafter'described, the-rubber heel.

In the nianufa'ct'm'e,after the rubber compound-has been properly'- calender'ed and 45 rou'glit into sheet form, the heel-lifts are cutout'witl-i a die, and are'ready'to be built into-the heel; ln'this construction, a metal frameis providcd'havinga flatbase 4, and projecting from this base hollow posts '5 of' 50 'substantially tubular form but usual'ly of spliteharacter and having separated arms 6, between-whichare intervals 7. The hollow ofthe postextends throughthe base'by a perforati(m'=-8,for the p'assage'of a fastening nail 9,-th'ehead'of which'may be driven home *in the-post against-"the base. Each post is substantially cylindrical, butthe armsfi mavhave some flexibility, sdthat they may "be slightly pressed toward the axis of the post, to provide fora slight ta-pei so toward itslencl portion. Each post i"' dsigned to be encircled'with a packiil or plug offrictionized canvas or other 'siiitable' material, rolled into a spool of suflicient'di ameter and length and having a. hollow ter'to-recei\-'e the frame post, which it is-'designed to hug firmly. Each-frame'iis pro-' vided with a suitable numberof these posts? The top lift or Wear lift 2 of theheel'hav? I"10:

ing'been tapped to provide-holes12' for 'th posts and their plugs, the frame is 'ap pfl thereto, the postsand plugs beingfoi'ce into the holes, which may be made slightly smaller in'diameter than the plug's',-so that the plugs will-be closely enga gedf'by"theta holes. The frame base engages the-inner surface'or that surface of thetop lift which isrdesigned to be joined to the next lift, 3,- of'the' heel, which is cemented and joined to the lift 2, the'ceinent'eoveringvin.thefr ainef' base; Theselifts and the intermediate" frame are placed in -a mold and compressed and vulcanized, so that they provide a-solid' heel, in which the "posts and plugs'havv" I their ends-substantially flush with or a little' below the \vear'sui'faee of thelift 2. In the construction, the-frame-is placed in the rear; portion of-the heel, or near its back, and is". designed to toughei'i. and strengthen the same, serving an important purpose in reventing the heel from running down in use, and' in" guarding against slipping. When theposts and their plugs are forced into theholes of the heel", the pressure is designed to be sufficient to bend the arms-off the post slightly inward, or tow'ard the axisof'the'hollow of'the post, so' that the plug? assumes a slight taper. In thiscase, the arms may be separated 'sufliciently for the introductionof the fastening nail, and after the-latter has been driven home and the p driving punch withdrawn, the arms will as? T sume their inclined relation, more or less," thereby restoring th'e'taper relation and pre-- venting the plug from coming out of its seat 1105 in the lift. The vulcanization ivill cementf and connect the twoheel lifts and secure the." metal frame plate between said lifts, and will at the same time cement thepacking; plugs to the lower lift and form a unitary 119 article; In. Fig. 6 of the drawing a modification is shown wherein the frame plate is extended,

usually' to accord with the heel contour and take the place of the washers commonly employed betai'leen the heel lifts fo'r the fasteningnails. l

What I claim is:

1,- An attachment for rubber heels and "other tread surfaces, comprising metal frame plate provided with a post extension, and a plug pf rubber-coated material surrounding said, post, said frame plate extending across and having bracing engagement with the top of said plug.

2. An attachment for rubber heels and other tread surfaces, comprising a metal frame plate provided with a compressible post extension,-anda compressible plug of rubber-coated material surrounding said post. t

.1 3. An attachment for rubber heels and other tread surfae com'prisinga metal frame plate proivid'e with anormally cylindrical compressible Yinst extension, and a; normally cylindrical compressible plug of plate liei ngjprovidedwith-fa perforation at -the innci end of said.p'ost, said perforation ameter of said post. 6. In a rubber lift, aim-adjoining lift, a metal frame plate cementedbetween the lifts and having a havin a dia netc'r les's than the internal dipost extension projecting through the perfo-,

ration of the wear lift, anda plug of rubbercoated material surrounding said post and closely engaging the same and cemented to the wall of said perforation.

ration, said perforation being normally of. diameter less than the normal diameter of 'ing lift,-a metal frame plate cemented hefor rubber heels and heel, 'a perforated wear 7. In a rubber heel, awear lift having a perforation, an adjoining lift, a metal frame. I

plate cemented between the lifts and having a post extension projecting through the per- 'forat'ionof the wear lift, and'a'compressed tapered plug of rubber-coated material surrounding said post and closely engaging the same and cemented to the wall of said perfosaid plug. 8. In a rubber heel, a wear lift having a normally cylindrical perforation, arr-adjointween the, lifts and having-a post extension projecting through the perforation. of the. wear. lift, and a normally cylindrical com-1 pressed tapered plugof rubber-coated mate-- rial surrounding SBJdPOSlJ andclosely en gaging the same and cemented to the walli of said perforation;

9. In a rubber heel, a perforated ,w'ea 'r' lift, an adjoining lift, a metal frameplate. oe-' mented between the- 'lifts and liavingt-aiholfl low split taperingpost hai'ing ela'sticyildable branches projeetingthrough the perfos ration of the wear lift,=and'-a. rubber coated tapered packing plug surroundingsaid-postand closelyengaging the same and cemented.

to the w all .of saidperforation, said hollow.

post being-adapted to receive a fastening device. I

110. In a rubber heel, a wear lift having normally cylindrical perforations, an ad oining upper liftfa metal frame plat-e ce: ine'nted between the lifts-and having a plurality ofhollow split tapering ppsts lfaving 1 yieldable elastic branches projectmg- 1nto; the

perforations of'th'e wear lift, and. .;i. bbe rf coated tapered packing plugs surrounding said posts and elastically engag ngand hav ing cement connection with the walls (if-said perforations, ed to receive fastening dev1ces.-..

said hollow posts"beinga'daptlil In-testimony whereof Ian); my signature,

in presence of two. witnesses. SAMUEL J5 HARRIS; Witnesses S. C. HILL,

STUART 'HILDEK. 

